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Hi,
Unfortunately, it is not possible to create two oceanStates in UWSim, this is controlled by osgOcean that simulates the visual characteristics of the ocean thus it would require to modify osgOcean itself in order to be able to do it.
Anyway, this only controls the visual characteristics of the ocean, it has no effect in the vehicle physics that is controlled dynamically by underwater_vehicle_dynamics package when running a dynamic simulation as explained here. This node accepts an external forces input via ROS topic so you can add any perturbation force to it in order to simulation underwater currents for the vehicles.
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